three weeks holiday

[joham]

You want three weeks holiday? You should be so lucky!

The sentence above comes from Longman Dictionary 4th edition, lucky.

My question is whether we can use 'three weeks holiday' instead of 'three weeks' holiday'. And by the way, does the sentence mean 'You should be so lucky but you won't be'?

Thank you very much!

[Horsa]

I don't see a difference between your two examples.

"You should be so lucky!" means that the speaker does not belive the holiday will be granted.

[jctgf]

isn't it a "three-week" holiday?

just like a 5-year old boy?

thanks